Greyscale calibration on very simple user menu tv - AVS Forum
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post #1 of 9 Old 06-26-2012, 01:34 PM - Thread Starter
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Hi,

I will get the colorimeter the next week but i have a question.

I have a plasma tv, old, (2008) and the user menu is very simple, i don´t have 10 point calibration.

Just R G B sliders that affect the whole picture.

My question is, which part of the pattern i should focus more? the darker? middle?or higher?

Some says the higher since they are more representatives to skins tones.
Others says the Middle, since it´s the reflect more of the most content.


Thanks
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post #2 of 9 Old 06-26-2012, 01:52 PM
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Quote:
Originally Posted by booker21 View Post

Hi,
I will get the colorimeter the next week but i have a question.
I have a plasma tv, old, (2008) and the user menu is very simple, i don´t have 10 point calibration.
Just R G B sliders that affect the whole picture.
My question is, which part of the pattern i should focus more? the darker? middle?or higher?
Some says the higher since they are more representatives to skins tones.
Others says the Middle, since it´s the reflect more of the most content.
Thanks

you want to lower overall grayscale error from black to white

but most content is in the midrange, so that's priority #1

next most used range is the low end, so that's priority #2

the least used range is the top end, so it's the last priority

however, you don't want huge errors at any given point, so try to keep RGB tracking as flat/linear as possible.
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post #3 of 9 Old 06-26-2012, 02:39 PM - Thread Starter
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Thanks. That's help a lot.

to get an idea midge range is between ire 30 to 70 ? Or what ire I should aim

I guess I had it the other way. I thought that upper scale was the most important.



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post #4 of 9 Old 06-26-2012, 04:40 PM
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"If most of the points are between 3-10 then you may want to see if you can tweak things just a little bit to to see if you can obtain more accurate readings across the entire range or make things better in the critical 40-70 IRE range."

"Part of the trick to adjusting greyscale is to figure out exactly where to make compromises if we can't get every reading from 10 to 100 IRE to fall exactly on the D65 point. It's primarily important to get the 50-70 IRE midrange correct, then the under 50 IRE low end correct, and finally the high end above 70 IRE. If you have to sacrifice somewhere, sacrifice the 70-100 IRE range as most of the content is under that range."

http://www.curtpalme.com/forum/viewtopic.php?t=10457

so midrange is about 40%-70% stim
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post #5 of 9 Old 06-26-2012, 10:06 PM
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It also might not be possible to answer this without testing on the TV first. Perhaps with how the sliders work, if you adjust them to 50, everything from 20-60 will come into line, and if you adjust them at 70, everything from 30-90 will come into line. Until you know how they behave, it's hard to answer that question, so the best is likely to be to try a variety of targets, see what you get, and then decide. It'll probably take a while and some trial and error to figure out the best approach.

Chris Heinonen
Senior Editor, Secrets of Home Theater and High Fidelity, www.hometheaterhifi.com
Displays Editor, AnandTech.com
Contributor, HDGuru.com and Wirecutter.com
ISF Level II Certified Calibrator, ReferenceHomeTheater.com
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post #6 of 9 Old 06-26-2012, 10:58 PM
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my Plasma is an 08 model...
but with service menu access you can do a much better job

what model is your TV, the access codes may be here for the service menu
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post #7 of 9 Old 06-27-2012, 07:20 AM - Thread Starter
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It`s a PG60 LG

I entered the service menu once but to be honest i didn`t understood much so i quieted. I didn`t want to mess anything on the service menu.

Last question, i will be using the AVS709 video from this site to calibrate.
I know this is not my cse since i only have 1 single RGB slider. But for those with 10 point calibration.

What video they used? the windowed? or the full screen?

I`m asking this because i see that the plasmas has that technology that changes the Whites levels if they are showing on the full screen or in windowed.
WHen you calibrate the display, the white ABL i think is called needs to be high at maxium contrast (small window) or at the lowert? (full window)
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post #8 of 9 Old 06-27-2012, 12:38 PM
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For plasma you'd use a window, for LCD and projectors you can use either window or full screen, as a general rule.

Chris Heinonen
Senior Editor, Secrets of Home Theater and High Fidelity, www.hometheaterhifi.com
Displays Editor, AnandTech.com
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post #9 of 9 Old 06-27-2012, 02:48 PM - Thread Starter
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Quote:
Originally Posted by Smackrabbit View Post

For plasma you'd use a window, for LCD and projectors you can use either window or full screen, as a general rule.

Thank you
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